Re: Photoshop Gamut warning vs ColorThink
Re: Photoshop Gamut warning vs ColorThink
- Subject: Re: Photoshop Gamut warning vs ColorThink
- From: email@hidden
- Date: Sat, 23 Feb 2008 12:20:39 -0500
Lars Borg writes on Fri, 22 Feb 2008 22:51:46 -0800
> In my view, the A2B tag is useless as a gamut indicator.
There are 2 gamut types deriveable from a Profile and which one to use
depends upon the question being asked.
The A2B gamut reflects the maximum extent of the colorant set; can be
defined with high precision; does not reflect print constraints.
The B2A gamut reflects print constraints; due to nature of B2A xform its
boundary positions possess a far higher degree of uncertainty in
comparison to its A2B counterpart.
The person who started this thread (Mike Eddington, Date: Thu, 21 Feb 2008
10:39:31 -0500), asked the following question:
> ... if I want to determine a group of Pantone colors that are within a
particular gamut ...
I would submit that the A2B gamut is more appropriate to provide his answer
than the B2A gamut. He's intersted in the intrinsic properties of a
particular colorant set free of any constraints.
People who want to know if a given color is in-gamut for a particular RI of
a particular Profile when printed on a particular Printer are better served
by the B2A gamut.
I would also argue that a Perceptual and Saturation gamut alarm should be
no more ambiguous to interpret than a gamut alarm applied to the
Relative/Absolute RI. In principle, the B2Ax table of each RI will sweep
out a unique gamut. The question a gamut alarm should be answering is
whether an initial color is in or out of that B2A gamut. It should not be
answering the question whether that initial color is inked colorimetrically
in any of the Rendering Intents. The Perceptual/Satn RI move colors
around. In general, this latter question is not answerable by a gamut
alarm.
Harold
TOSHIBA AMERICA BUSINESS SOLUTIONS 2 Musick, Irvine, CA 92618
Harold Boll | 1.781.856.5174 | email@hidden
" The sunlights differ, but there is only one darkness. "
Ursula K. Leguin
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